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#1 |
Registered User
Join Date: Feb 2008
Location: hamilton, ga
Posts: 48
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where do I get vacum for a brake booster
my truck is a 3 spd manual & i'll be doing this soon. the vacum off the bottom of the carb goes to my pcv valve, can i tee off this?
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#2 |
Registered User
![]() Join Date: Sep 2007
Location: Fairdale, Kentucky
Posts: 561
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Re: where do I get vacum for a brake booster
Andy,
I believe that if you tee off the carb in that location you will only have vacum when the throttle plate is opened which is generally not the case when braking. I believe that port is vaccum advance port. I might be completely wrong here. SO SOMEONE please correct me. You should be able to tape off of any of the intake spots ported for vacum. You obviously loking for a constant source of vaccum and I don't believe that carb base is your best choice. Good luck. |
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#3 |
Son of a gun
Join Date: Jan 2007
Location: Hot Springs, Arkansas
Posts: 1,636
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Re: where do I get vacum for a brake booster
Factory power brake trucks get vacuum from the rear of the carb base. If your truck never had power brakes and the carb is original, your base is probably not drilled and tapped there. You can drill it and tap it, I did that on my scrap yard truck, or you can put a T on the manifold and go thet it from there.
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Bill BEATERS ARE NEATER Last edited by Bus Ted Knuckle; 03-26-2008 at 11:06 PM. |
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#4 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: where do I get vacum for a brake booster
I agree you want a vacuum port that has vacuum the whole time. Never hook it up to the carb.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#5 |
Registered User
Join Date: Dec 2006
Location: Idaho
Posts: 210
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Re: where do I get vacum for a brake booster
PCV goes to air cleaner spacer on my truck. Booster goes to the back of the carb.
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72 C2500 LWB 402 Sierra Grande 05 Odyssey 08 Tundra |
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#6 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: where do I get vacum for a brake booster
On my '69 there is a tee that's towards the back of the intake manifold. It feeds the power brakes and the vacuum modulator on the tranny...
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#7 |
Son of a gun
Join Date: Jan 2007
Location: Hot Springs, Arkansas
Posts: 1,636
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Re: where do I get vacum for a brake booster
there is just as much vacuum on the bottom of the carb as there is any where else on the manifold, more even. And like I said in my original post, the factory put them to the rear of the carb base
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Bill BEATERS ARE NEATER |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: where do I get vacum for a brake booster
the confusion here is, on the carb, you have manifold vacume, which is full vac all the time, and you have ported vacume, which is only when you hit the throttle.
The fittings up high are part time ported vac, the lower ones (like where the factory ran the booster hose to) is full manifold vacume. You can put it on the intake if you like, HOWEVER... You'll want to make sure that the port gets vacume from all the engine, not just on one runner to one cylinder. I had a booster pop on my first caddy engine, and it was ran to one cylinder. The rush of fresh unregulated air to that one cylinder caused an instant lean condition and shattered a piston. Last edited by Longhorn Man; 03-26-2008 at 11:39 PM. |
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#9 |
Registered User
Join Date: Feb 2008
Location: hamilton, ga
Posts: 48
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Re: where do I get vacum for a brake booster
I just went out & looked & my vacum line is coming off the base of the carb going to my pcv valve, It has a screwed in fitting if i'm not mistaken its the same place that it was on the truck I took the setup off of. I also have another smaller vacum port next to it that runs to my air cleaner. i have a factory style ugly air cleaner assy. that i'll be taking off soon. could i just run it off that?
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#10 |
Registered User
Join Date: Sep 2007
Location: Emporium,Pa
Posts: 248
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Re: where do I get vacum for a brake booster
On the Rochester Carb the power brake booster runs to that screwed in port. Your PCV should run to the air cleaner lid into a small filter built into the side of the main body of the cleaner. Then those gasses are pulled down into engine and burnt. (Emmisions deal). someone can correct me on that part but thats the way the booster is set up on the Q-Jet on my truck.
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"When you were born, you cried and the world rejoiced. Live your life so that when you die, the world cries and you rejoice." [Cherokee saying] 2001 Dodge Ram Sport 1500 4x4. (old ride) 1987 GMC V1500 Sierra Classic ("new" ride) Last edited by ChevyC102007; 03-27-2008 at 03:19 PM. |
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#11 | |
Grand PooBaa Member
Join Date: Jan 2001
Location: LA, CA
Posts: 5,302
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Re: where do I get vacum for a brake booster
Quote:
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#12 |
Registered User
Join Date: Sep 2007
Location: Emporium,Pa
Posts: 248
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Re: where do I get vacum for a brake booster
A friend of mine told me that if you change to another carburetor other than the factory Q-Jet, you can hook into the plugged port between the carburetor/ distributor(middle of the intake as viewed from the front between the runners on stock manifold, aftermarket manifolds have it on the edge of #8 runner). Seeing as how the power booster runs off manifold vaccum I think this could work. Otherwise try calling the Edlebrock Tech Line...they may be able to help if ya havent already.) Im sure someone else on the board can correct me on this but its just my $.02
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"When you were born, you cried and the world rejoiced. Live your life so that when you die, the world cries and you rejoice." [Cherokee saying] 2001 Dodge Ram Sport 1500 4x4. (old ride) 1987 GMC V1500 Sierra Classic ("new" ride) Last edited by ChevyC102007; 07-14-2008 at 08:01 PM. |
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#13 |
Registered User
Join Date: Oct 2006
Location: Washington
Posts: 316
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Re: where do I get vacum for a brake booster
Same here, I just did the conversion for front power disc.
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1970 C10 - ECE 3.5/5 drop, dual exhaust with turbo mufflers, front discs http://67-72chevytrucks.com/vboard/s...d.php?t=272458 2000 Buick Regal GS - Supercharged 3.8 V6 240hp, 1/4 mile 15 seconds |
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#14 |
Grand PooBaa Member
Join Date: Jan 2001
Location: LA, CA
Posts: 5,302
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Re: where do I get vacum for a brake booster
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#15 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: where do I get vacum for a brake booster
On the back of your edelbrock carb (you'll need to unbolt the carb to see it, or stand on your head under the hood
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#16 | |
Grand PooBaa Member
Join Date: Jan 2001
Location: LA, CA
Posts: 5,302
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Re: where do I get vacum for a brake booster
Quote:
Ok I felt that plug behind the carb, now it makes sense. A hose barb fiting, is that what its called? |
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#17 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: where do I get vacum for a brake booster
yeah a threaded hose barb, NAPA or any decent parts store.
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#18 |
Grand PooBaa Member
Join Date: Jan 2001
Location: LA, CA
Posts: 5,302
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Re: where do I get vacum for a brake booster
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#19 |
Registered User
Join Date: Oct 2006
Location: Washington
Posts: 316
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Re: where do I get vacum for a brake booster
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1970 C10 - ECE 3.5/5 drop, dual exhaust with turbo mufflers, front discs http://67-72chevytrucks.com/vboard/s...d.php?t=272458 2000 Buick Regal GS - Supercharged 3.8 V6 240hp, 1/4 mile 15 seconds |
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#20 |
Registered User
Join Date: Oct 2006
Location: Washington
Posts: 316
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Re: where do I get vacum for a brake booster
Here is the picture of where I am running my vacuum from for the brake booster. I just ran a T from the original one at the back of the intake manifold that also goes to the transmission. Let me know if you need a different one.
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1970 C10 - ECE 3.5/5 drop, dual exhaust with turbo mufflers, front discs http://67-72chevytrucks.com/vboard/s...d.php?t=272458 2000 Buick Regal GS - Supercharged 3.8 V6 240hp, 1/4 mile 15 seconds |
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